When Wonder Woman tore off Cyborg's arm, SHE STILL THOUGHT HE WAS CHEETAH! There is a reason you don't see what she sees when she does that.
More so the fact that she was willing to do it, despite the fact that Cheetah and Wonder Woman's rivalry is rarely given much explanation or backstory.
Though she did apologize after she tore it off and offered to help "her" get medical aid.
This also begs the question of how many average humans (civilians and cops) were just pummeled half to death by a crazed superheroine. Their limbs aren't quite as replaceable.
At the end of the movie, Superman points out that Batman never made a plan for if he himself went rogue. Batman replies that the Justice League is his failsafe. However, as the movie demonstrated, Batman was able to come up with very successful plans to defeat each of the Justice League, with only some slight modification to make them lethal. If Batman ever does go rogue, he's more than capable of handling the Justice League by himself! Especially since Superman gave him the kryptonite bullet.